US5132178A
Expired / Lapsed
US
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Ceramic matrix composites exhibiting high interlaminar shear strength
Assignee: Corning Inc
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Filing: 1987-05-08
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Granted: 1992-07-21
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Expires: 2007-05-08
Abstract
Abstract Fiber-reinforced ceramic matrix composites incorporating a glass-ceramic matrix of lithium aluminosilicate composition in which is disposed a fiber reinforcement phase including at least one layer of unidirectionally oriented fibers (e.g. SiC), the matrix further comprising a whisker reinforcement phase selected from the group of SiC, alumina, HfC and Si 3 N 4 , the whiskers imparting substantially improved transverse modulus of rupture strength and interlaminar shear strength to the composite.
Inventors
- 👤 Kenneth Chyung
- 👤 Kishor P. Gadkaree
- 👤 Mark P. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:31
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/628; C04B35/62844; C04B35/62847; C04B35/62849; C04B35/71; C04B35/78; C04B35/80; C03; C03C; C03C14/00; C03C14/002; C04B35/01; C04B35/16; C04B35/18; C04B35/19; C04B35/64; C04B35/645; C03C2214/00; C03C2214/02; C03C2214/06; C03C2214/20; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3201; C04B2235/3203; C04B2235/3205; C04B2235/3206; C04B2235/3215; C04B2235/3231; C04B2235/3244; C04B2235/3251; C04B2235/3284; C04B2235/36; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5224; C04B2235/524; C04B2235/5244; C04B2235/5252; C04B2235/5268; C04B2235/5276; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/96; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2949
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A fiber-reinforced ceramic matrix composite article exhibiting enhanced transverse strength and interlaminar shear strength which consists essentially of a fiber reinforcement phase making up 30-85% by volume of the article and a ceramic matrix phase making up 50-70% by volume of the article, wherein (a) the ceramic matrix phase comprises an inorganic whisker phase homogeneously dispersed therein and constituting 1-30% by weight of the article, (b) the ceramic matrix phase further comprises a matrix material consisting essentially of a lithium alumino-silicate crystal phase selected from the group consisting of β-quartz and β-sodumene; and (c) the fiber reinforcement phase comprises at least one layer of fiber reinforcement wherein the fibers are unidirectionally oriented; said composite article exhibiting a transverse flexural strength of at least about 3670 psi and an interlaminer shear strength of at least about 9869 psi.
Claim 2
Dependent Claim
137 words
A fiber-reinforced ceramic matrix composite article exhibiting enhanced transverse strength and interlaminar shear strength which consists essentially of a fiber reinforcement phase making up 30-85% by volume of the article and a ceramic matrix phase making up 50-70% by volume of the article, wherein (a) the ceramic matrix phase comprises an inorganic whisker phase homogeneously dispersed therein and constituting 1-30% by weight of the article, (b) the ceramic matrix phase further comprises a matrix material consisting essentially of a lithium alumino-silicate crystal phase selected from the group consisting of β-quartz and β-sodumene; and (c) the fiber reinforcement phase comprises at least one layer of fiber reinforcement wherein the fibers are unidirectionally oriented; said composite article exhibiting a transverse flexural strength of at least about 3670 psi and an interlaminer shear strength of at least about 9869 psi.
Claim 3
Dependent Claim
31 words
A fiber-reinforced ceramic matrix composite article in accordance with claim 1 wherein the inorganic whisker phase consists of whiskers selected from the group consisting of SiC, alumina, HfC and silicon nitride.
Claim 4
Dependent Claim
28 words
A fiber-reinforced ceramic matrix composite article in accordance with claim 2 wherein the inorganic whisker phase consists of SiC whiskers and constitutes 5-25% by weight of the article.
Claim 5
Dependent Claim
19 words
A fiber-reinforced ceramic matrix composite in accordance with claim 3 wherein the fibrous reinforcement phase consists of SiC fibers.
Claim 6
Dependent Claim
71 words
A fiber-reinforced ceramic matrix composite in accordance with claim 4 wherein the ceramic matrix phase has an oxide composition, in weight percent, of about 60-75% SiO 2 , 15-25% A Li 2 O, 0-10% of oxides selected from the group consisting ZrO 2 , Nb 2 O 5 and Ta 2 O 5 , 0-10% MgO, 0-12% ZnO, 0-10% BaO, 0-5% Cs 2 O, and 0-5% As 2 O 3 .
Claim 7
Dependent Claim
39 words
A fiber-reinforced ceramic matrix composite in accordance with claim 5 wherein the ceramic matrix phase comprises 1-10% total of Nb 2 O 5 +Ta 2 O 5 , 1-5% ZrO 2 m and 0.5-3% As 2 O 3 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-21 | 1996-01-20 | 1996-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-21 | 2000-01-20 | 2000-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-21 | 2004-01-20 | 2004-07-21 | $7700.00 | Window Closed / Lapsed |